摘要
将非傅立叶热传导模型(用于超薄热涂层)与傅立叶热传导模型(用于结构层)相结合求解温度场,运用有限元法求解热涂层热应力和裂纹驱动力,并分析结构层材料热扩散系数的变化对热涂层的热力学性能(温度场、应力场和断裂性能)的影响.研究表明,结构层材料性能变化对温度场的影响主要表现在热冲击后期,对热应力和裂纹尖端驱动力后期的变化也有一定的影响.
When thermal barrier coatings （TBCs） are made into laminate in micro/nano scale, the heat transfer theory in macro scale, Fourier heat equation, can not be used. But it can still be used in the substrate under TBCs. In this paper, the temperature field obtained from combining non-Fourier heat conduction model for TBCs and Fourier heat conduction model for substrate is used as the thermal load in the finite element analyses of thermal stress and J-integral of an edge crack in the TBCs. Influence of thermal diffusivity of substrate on the TBCs thermodynamic properties （temperature field, thermal stress and J-integral） is analyzed. The conclusion is that influence takes effect in the final thermal shock.
出处
《力学与实践》
CSCD
北大核心
2008年第4期68-72,共5页
Mechanics in Engineering
基金
福建省科技厅(JB06035)
国家自然科学基金(10472084)资助项目．
关键词
超薄热涂层
非傅立叶热传导
温度场
热应力
J积分
very thin TBCs, non-Fourier heat conduction, temperature field, thermal stress, J-integral
